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mongoDB
for sysadmins
Jordi Soucheiron - @jordixou
Software developer & sysadmin @ DEXMA
@sudoersbcn 2013/6/4
What is mongoDB
 Document oriented noSQL database
 Auto sharding -> scales horizontally
 Auto replication -> high availability
 Atomic in-place updates
 No transaction support
 JSON queries and results
 Open source with commercial support by 10gen
What is it used for?
 Storing files
 Storing logs
 Queue systems
 Data mining
 …
Basic mongoDB setup
 Pros: Simple
 Cons: No sharding, no high-availability
Small mongoDB setup
 Pros: High-availability, optional delayed node
 Cons: No sharding
Advanced mongoDB setup
Advanced mongoDB setup
 Pros:
 High-availability
 Reads and writes are distributed amongst all nodes
 You choose what kind of replication you want
 You choose what collections are sharded
 You choose the sharding key
 Cons:
 More complexity than the other solutions
 You ALWAYS want 3 config servers
Demo time
Configure Vagrant
 Init Vagrant:
 Modify Vagrantfile:
Vagrant.configure("2") do |config|
config.vm.box = "precise64"
config.vm.box_url = "http://files.vagrantup.com/precise64.box"
config.vm.provision :puppet do |puppet|
puppet.manifests_path = "manifests"
puppet.manifest_file = "init.pp"
end
end
vmvagrant init precise64 http://files.vagrantup.com/precise64.box
Configure Puppet
 mkdir Manifests
 vi init.pp:
package { 'mongodb':
ensure => present,
}
Start Vagrant and mongoDB
 vagrant up
 vagrant ssh
 sudo /etc/init.d/mongodb stop
 mkdir –p ~/mongo/db1 ~/mongo/db2 ~/mongo/db3
 mongod --port 27017 --dbpath ~/mongo/db1 --replSet rs0 --
smallfiles --oplogSize 128 --rest
 mongod --port 27018 --dbpath ~/mongo/db2 --replSet rs0 --
smallfiles --oplogSize 128
 mongod --port 27019 --dbpath ~/mongo/db3 --replSet rs0 --
smallfiles --oplogSize 128
Add nodes to the replica set
 mongo --port 27017
rsconf = {
_id: "rs0",
members: [
{
_id: 0,
host: "127.0.0.1:27017"
}
]
}
rs.initiate( rsconf )
rs.add("127.0.0.1:27018")
rs.add("127.0.0.1:27019")
Questions

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mongoDB for sysadmins

  • 1. mongoDB for sysadmins Jordi Soucheiron - @jordixou Software developer & sysadmin @ DEXMA @sudoersbcn 2013/6/4
  • 2. What is mongoDB  Document oriented noSQL database  Auto sharding -> scales horizontally  Auto replication -> high availability  Atomic in-place updates  No transaction support  JSON queries and results  Open source with commercial support by 10gen
  • 3. What is it used for?  Storing files  Storing logs  Queue systems  Data mining  …
  • 4. Basic mongoDB setup  Pros: Simple  Cons: No sharding, no high-availability
  • 5. Small mongoDB setup  Pros: High-availability, optional delayed node  Cons: No sharding
  • 7. Advanced mongoDB setup  Pros:  High-availability  Reads and writes are distributed amongst all nodes  You choose what kind of replication you want  You choose what collections are sharded  You choose the sharding key  Cons:  More complexity than the other solutions  You ALWAYS want 3 config servers
  • 9. Configure Vagrant  Init Vagrant:  Modify Vagrantfile: Vagrant.configure("2") do |config| config.vm.box = "precise64" config.vm.box_url = "http://files.vagrantup.com/precise64.box" config.vm.provision :puppet do |puppet| puppet.manifests_path = "manifests" puppet.manifest_file = "init.pp" end end vmvagrant init precise64 http://files.vagrantup.com/precise64.box
  • 10. Configure Puppet  mkdir Manifests  vi init.pp: package { 'mongodb': ensure => present, }
  • 11. Start Vagrant and mongoDB  vagrant up  vagrant ssh  sudo /etc/init.d/mongodb stop  mkdir –p ~/mongo/db1 ~/mongo/db2 ~/mongo/db3  mongod --port 27017 --dbpath ~/mongo/db1 --replSet rs0 -- smallfiles --oplogSize 128 --rest  mongod --port 27018 --dbpath ~/mongo/db2 --replSet rs0 -- smallfiles --oplogSize 128  mongod --port 27019 --dbpath ~/mongo/db3 --replSet rs0 -- smallfiles --oplogSize 128
  • 12. Add nodes to the replica set  mongo --port 27017 rsconf = { _id: "rs0", members: [ { _id: 0, host: "127.0.0.1:27017" } ] } rs.initiate( rsconf ) rs.add("127.0.0.1:27018") rs.add("127.0.0.1:27019")